The Economy of the World | Chapter 4: The Promise in Your Pocket — Money, Banks and Credit

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A customer taps a card and leaves with a bag of groceries. The shopkeeper has received no useful object in return. Somewhere, records have changed: the customer’s account has less, the shop’s account has more, and the payment system has carried instructions between them.

The transaction works because the shopkeeper expects the new balance to be usable for other payments. Employees, suppliers and landlords are likely to accept it in turn. Money allows one exchange to connect with many others, without requiring everybody to want the same things at the same moment.

This ordinary convenience rests on a structure of promises, institutions and accounting. Understanding that structure helps us see why banks matter, why credit can support production and why financial trouble can spread into daily life.

Money is useful because it is widely accepted. It is not the same thing as all the wealth in the world, and creating more of it does not automatically create more food, homes or skilled labour.

Money commonly serves as a means of payment, a unit in which prices and debts are stated, and a way of carrying purchasing power into the future. It need not perform the last function perfectly: inflation can reduce what a given amount will buy.

Cash is one familiar form. A deposit in a commercial bank is another. Central bank reserves are balances held by eligible institutions at the central bank and used, among other purposes, to settle payments between banks. These are related forms of money, but they are not interchangeable in every person’s hands. An ordinary shopper does not usually pay for vegetables by transferring a reserve balance directly.

The Bank of England’s introduction distinguishes currency, bank deposits and central bank reserves, explaining the promises represented by each within a modern monetary system. Institutional arrangements vary across countries, so the description is a foundation rather than a statement that every payment system is identical. Source: Bank of England, Money in the modern economy.

A bank deposit is an asset to the customer: a claim that the bank will honour. It is a liability to the bank: something the bank owes. The bank’s loans are assets from its perspective because borrowers owe it future payments.

This change of viewpoint is essential. The same financial contract can appear on opposite sides of two balance sheets. A mortgage is a debt for the household and an asset for the lender. One person’s financial wealth may be another person’s obligation.

Money’s acceptance is supported by more than a feeling of confidence. Laws, public institutions, payment infrastructure, taxation arrangements and the ability to convert or transfer balances all help organise its use. Different monetary systems combine these elements differently. Trust becomes more durable when it is backed by arrangements that can be examined and enforced.

It is tempting to imagine a bank as a cupboard containing other people’s savings. The bank opens the cupboard, removes some money and hands it to a borrower. That picture misses an important part of modern commercial banking.

When a bank grants a loan, it can create a matching deposit in the borrower’s account. The loan is a new asset for the bank; the deposit is a new liability. The Bank of England explicitly explains that banks do not merely pass on previously deposited money through a mechanical money-multiplier process. Source: Bank of England, Money creation in the modern economy.

Consider a fictional repair business borrowing 10,000 illustrative currency units, written as CU10,000, from a bank. Immediately after the loan is recorded, the business has a CU10,000 deposit and a CU10,000 debt. Its bank has a CU10,000 loan asset and owes the business the CU10,000 deposit.

The business has gained spending power, but not CU10,000 of free net wealth. Its new asset is matched by an obligation. Whether the borrowing improves its eventual position depends on what it does with the funds and whether the results justify the costs.

Suppose it buys equipment from a supplier that uses the same bank. The bank can move CU10,000 from the business’s deposit to the supplier’s deposit. The deposit has changed owner; the business’s loan remains outstanding. If the supplier uses another bank, the banks must also settle the payment between themselves.

That settlement matters. A bank can create its own deposit liability when lending, but it cannot create another bank’s willingness to accept an unpaid claim without limit. It must meet the obligations generated when customers transfer or withdraw funds.

The repair business can now undertake work using the equipment. If the equipment saves time or makes new services possible, the loan may have supported productive activity. If the equipment is unsuitable or customers do not arrive, the same borrowing can leave the business with a difficult debt. Credit finances a possibility, not a guaranteed success.

If banks can create deposits, why do they not lend unlimited amounts to everybody?

The first constraint is the quality of the loan. A loan asset is useful only to the extent that the borrower can repay or the lender can otherwise recover value. Creating a large volume of weak loans can destroy a bank rather than enrich it.

The second is capital. In a simple balance sheet, equity capital is the value of assets minus liabilities. It absorbs losses before creditors bear them. If a bank has CU100 in assets and CU90 in liabilities, its equity is CU10. If assets lose CU6 in value while liabilities remain CU90, equity falls to CU4.

That example is deliberately simplified. Regulatory capital has detailed definitions, but the underlying purpose is to provide capacity to absorb losses. European banking supervisors explain that capital requirements depend on risks and include additional buffers. Creating a new customer deposit does not, by itself, create this loss-absorbing capital. Source: ECB Banking Supervision, Why do banks need capital?.

The third constraint is liquidity: the ability to make payments when they fall due. A bank may hold valuable long-term loans while needing funds today to meet withdrawals and transfers. Capital and liquidity address different problems. The Federal Reserve distinguishes the resources available for short-term obligations from the cushion available to absorb losses. Source: Federal Reserve, Liquidity and capital.

Imagine a bank with sound loans that will be repaid over several years. If many depositors demand immediate transfers, those future repayments do not automatically supply today’s settlement funds. Conversely, a bank may temporarily have cash available while the value of its assets is too low to cover its debts. Access to cash cannot make genuine losses disappear.

Funding costs, regulation, risk management, customer demand and profitability also influence lending. Central bank policy affects financial conditions, including the costs and incentives surrounding credit. The details vary by monetary framework. “Banks create deposits” is therefore the beginning of an explanation, not permission to ignore every constraint on banking.

Return to the repair business. It earns money from customers and later repays CU1,000 of loan principal using a deposit at its bank. The bank reduces its loan asset by CU1,000 and reduces the business’s deposit by the same amount. In this simplified transaction, deposit money is extinguished as the principal is repaid.

If the deposit used for repayment begins at another bank, additional settlement steps are involved, but the distinction remains useful: creating a bank loan can create a deposit, and repayment of bank-loan principal can remove deposit money.

Interest is a different payment. It is income to the bank, before the bank pays its own expenses and recognises losses. We should not describe interest as simply cancelling the loan principal. Banks pay staff, purchase services, pay funding costs and may distribute profits, so money received as income can subsequently circulate through other spending.

This helps answer a common puzzle. If a loan creates only the principal, where can interest payments come from? They can be paid from income and existing circulating money. The same units of money can support multiple payments over time. There is no requirement that every interest payment be financed by a new loan created specifically for it.

That does not make debt effortless to repay. A business still needs adequate cash flow, and many borrowers can encounter difficulty together. The accounting possibility of paying interest is different from the practical capacity of each borrower to earn enough.

Not all credit creation works like commercial-bank lending. When a person lends an existing balance to a friend, the lender transfers purchasing power rather than creating a bank deposit by issuing a new bank liability. Non-bank lenders and financial markets have their own structures. Confusing all lending with bank money creation makes the financial system harder to understand.

A household may want a home before it has saved the full purchase price. A business may need equipment before it earns the revenue that equipment could help generate. A government may build infrastructure whose benefits extend across generations. Credit can bridge the gap between spending now and income later.

The gap creates risk. Future income may disappoint. Costs may rise. A borrower may face a payment in a currency different from the one in which it earns. A loan that can be repaid over twenty years may become dangerous if the lender can demand repayment much sooner.

A simple comparison helps. Two fictional firms each borrow CU50,000. One invests in equipment expected to reduce costs, after maintenance and financing expenses. The other buys an asset solely because it expects to resell it at a higher price. Neither outcome is certain, but the repayment stories differ. One depends on operating cash flow; the other may depend more heavily on finding a future buyer.

The purpose of this distinction is not to declare that all asset purchases are useless or that all business investment is wise. It is to ask what will generate the funds needed to honour the promise. The quality of the repayment mechanism matters more than an encouraging label.

Interest rates are part of the price of borrowing, but contracts contain other important terms: maturity, fees, collateral and rules about changing payments. The headline rate alone does not describe the complete obligation.

Credit also affects the wider economy. Lending can support demand and investment. If many borrowers cut spending to reduce debt at the same time, other people’s incomes can fall. A household’s sensible attempt to strengthen its own finances can therefore interact with similar choices elsewhere. Chapter 13 examines how such feedback can contribute to a crisis.

Money allows people to mobilise resources, but it does not abolish physical or human limits. A payment can reserve an available builder. It cannot instantly train a new one, create suitable land or make a delayed shipment arrive.

Suppose a town has enough workers and materials to build 100 homes this year. If financing allows more households to bid for those same homes while construction remains constrained, the extra spending power may push up prices rather than produce an immediate increase in housing. Over time, supply might respond, but only if the relevant obstacles can be overcome.

The reverse problem is possible too. A town may have idle workers, usable equipment and willing customers but insufficient finance or confidence to bring them together. Improving access to credit can then help activate resources that would otherwise remain unused. The effect depends on the situation.

This is why a claim about money needs to identify the mechanism and the conditions. More lending is not automatically good or bad. What is financed? What resources are available? Who bears the risk? How fragile are the promises? What happens if expectations prove wrong?

The card payment at the beginning of this chapter looks simple because a complex arrangement is doing its work quietly. We now know that the numbers in accounts represent claims and obligations, supported by institutions and constrained by risk.

The next question is what people do with that capacity to organise resources. Chapter 5 moves from the bank’s accounts into the firm: the place where skills, equipment and plans are combined to produce something others may want.

• Money, productive resources and net wealth are related but different things.
• Commercial-bank lending can create deposits, together with matching debts and bank obligations.
• Capital absorbs losses; liquidity helps meet payments when due.
• Credit is useful when its promises can be supported by realistic future resources and income.

Deposit: A customer’s claim on a bank.

Principal: The amount of a loan outstanding before interest.

Interest: Payment associated with borrowing over time.

Asset: Something of economic value or a claim held by a person or organisation.

Liability: An obligation owed.

Bank capital: Resources that can absorb losses, including equity and qualifying instruments.

Liquidity: Capacity to meet obligations when they fall due.

• Bank of England — Money in the modern economy.
• Bank of England — Money creation in the modern economy.
• ECB Banking Supervision — Why do banks need capital?.
• Federal Reserve — What is the difference between a bank’s liquidity and its capital?.

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